Welding-machine



'(No Model.) 2 SheetsSheet,1.

W. G. KROEGHER. WELDING MACHINE.

No. 568,911. Patnted Obt. 6, 1896.

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Patented Oct. 6, 1896.

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UNITED STATES PATENT OFFICE.

VILHELM O. KROEGHER, OF ALLEGHENY, PENNSYLVANIA.

WELDING-MACHINE.

SPECIFICATION forming part of LettersPatent No. 568,911, dated October 6, 1896.

Application filed April 20, 1896. Serial No. 588,268. (No model.)

To all whom it may concern:

Beit known that l, \VILHELM O. KROEGHER, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in WVelding-Machines, of which the following is a full, clear, and exact description.

Figure l is a top plan view of my improved machine. Fig. 2 is a cross-section on'the line 11 II of Fig. 1, and Fig. 3 is a longitudinal section on the line 111 III of Fig. 1.

My invention relates to machines employed for welding wherein a hammer is used; and it consists in an improved machine of this character in which the strength of the blow is entirely under the control of the operator, and in which the hammer is held and guided in its true motions without any possibility of side motion or wabbling.

It also consists more specifically in a machine of the above character for welding pipe wherein the machine is provided with means for scarfing one end of the tube, for welding the tube end thereon, and for swaging down the end portion.

In the drawings, in which similar numerals indicate corresponding parts, 2 2 represent side beams or bars supported upon suitable legs 3 and constituting the framework of the machine, the driving-shaft4 being supported in bearings at one end of this frame. Centrally secured to the driving-shaft 4 is a beltwheel 5, by which the shaft is driven, and secured to the shaft on each side of this pulley or belt-wheel are two cam-wheels 6 6, these cam-wheels having any suitable number of projections as desired. Near the rear portion of the pulley5, and on either side thereof, are the two arms or helves 7, forming the shank of the ham mer-stock 8, each one of these arms be ing pivoted to an upwardly-projecting rear portion 9 of the side bars. Each arm is provided with a downwardly-projecting lug 10, which,when the hammer is depressed, will be engaged by one of the cam-wheels 6, thus giving an oscillatory motion to the hammer. The outer face of each arm fits snugly against the inner face of the projection 9 which thus forms a guide for the wide base of the hammer-stock, preventing any side motion or wabbling of the hammer in its motions, and this feature of the forking or double-helve press the same downwardly. In front of their pivotal point these springs are secured to a common lever 12, having a link connection 13 to a foot-lever 13, pivoted to the base of the machine. The removable hammer 14 is provided with a reduced stern which projects through a longitudinal hole in the hammer-stock 8 and is secured in place by a suitable key 15, so that tools of different shape and character may be used with a single machine. Beneath the hammer and connecting the side bars 2 is a cross-bar 16, upon which is supported a curved spiral spring 17, upon the upper end of which'is carried a rest 18 for the hammer, a curved rod 19 connecting this rest with the lever 12, a suitable guide 20 being employed within the spring for the rod 1%). Upon one end of the frame beneath the end of the hammer are carried a central welding-horn 2-1, a scarfing-horn 22, and a swaging-block 23. The hammer is likewise provided upon its lower face with a hollow central welding portion 2-l, a scarfing portion 25, and a swaging recess 26. Beneath the horns, upon horizontal bolts 27 at one side of the frame, is carried a loosely-sliding gage .28, consisting of a cross-bar having end holes,

through which the bolts pass, and a central cavity, within which theswaged end of the' pipe fits when of proper size.

By using a loosely-sliding head with the gaging-aperture the operator is enabled to reciprocate the tube and thus drive it into the hole by a positive blow, the head remaining and moving with the end of the tube,thus

smoothing and sizing the swagedend.

The operation of welding a tube end upon the body of an old tube with this machine is as follows: The heated end of the tube being slid over the conical horn 22, the operator depresses the foot-lever 13,thus pulling down the yielding rest 17 and forcing down the arms 7 into contact with the cam-Wheels by means of the curved springs 11, the force of the blow being regulated by the amount that the footlever is depressed. The scarfing portion 25 of the hammer then acts to thin out and tawelded section is then swaged down in the registering recesses 23 and 26 and is driven into the central gaging-hole in the gage 28, thus forming ends of uniform external diameter.

The advantages of my invention will be apparent to those skilled in the art, since, on account of the double-helve shank of the hammer, a perfectly-vertical oscillatory motion is given, no side or rocking motions being possible. The force of the blow is easily regulated by the operator, who depresses the foot-lever more or less, aecordingas he wishes a stronger orlighter blow. The steps of scarfing, welding, and swaging are all carried out by the same machine, and it is evident that the work of the hammer can be easily varied by changing the hammer and the anvil-horns or other tools with which the hammer coacts.

Many changes may be made in the form and arrangement of the parts of the device without departing from my invention, since That I claim is- 1. In a welding-machine, a driven shaft having two cam-wheels thereon, a hammer having a bifurcated stock, each arm of the stock being pivoted to the frame in the rear of the cam-wheels, and the frame having, above the cam-wheels, guides arranged to contact with the two arms and prevent side motion of the hammer; substantially as described.

2. In a welding-machine, the combination with a swinging hammer, of a pivoted lever having a curved spring arranged to bear upon 4. In a Welding-machine, a hammer having a bifurcated stock, each arm of the stock being pivoted to a side frame, a driven shaft having cam-wheels arranged to contact with the stock-arms, and provided between said arms with a pulley; and a pivoted lever hav-' ing curved springs arranged to bear upon the arms of the hammer-stock, substantially as described.

5. In a machine for scarfing tubes, the combination with a scarfing-horn and a weldinghorn, of a swinging hammer having recesses arranged to cooperate with both of said horns; substantiallyas described.

(3. A scarfing-machine, having a scarfinghorn, a welding-horn, and a swaging-block, and provided with a swinging hammer, having portions arranged to cooperate with each of the horns and the swaging-block, substantially as described.

7. A machine for swaging pipe, said machine having attached thereto at one side a loosely-sliding head arranged to contact with the side of the machine and having a gagingaperture for the end of the pipe; substantially as described.

In testimony whereof I have hereunto set my hand.

WILI-IELM C. KROEGHER. \Vitnesses:

H. M. CORWIN, JAMES C. BOYCE. 

